Before you do anything, you are going to need to get a copy of RXTools Beta 8. A download can be found
here. Next what you are going to need to do is go on that one site which contains 3DS ISOs. To access the specific part of the website, you are going to need to go
to this Google search and find that link that from that
3DS site which has the
[MEGA] [CIA/BIN] MSET 4.X & 6.X backups, Browser backups, Update packs (All Regions) in its title. Now find the download to for the
6.X-msetdg.bin in your region. So if you're from Europe, download the EUR version. Your location on your profile indicates you are from the U.S., so you will need to grab the "USA" version.
After that is out of the way, move the
6.X-msetdg.bin that you just downloaded onto the root of your SD Card. You will also need to delete your "rxtools" folder and replace it with the one that is in the Beta 8 download. On top of that, you will need to go into the MSET folder from the RXTools Beta 8 download and move the code.bin onto the root of your SD card. Please note that if you have a DS flashcard, you only need the rxCakeROP.nds or rxinstaller.nds on your DS flashcard's SD card. Then just run either one and install the
6.X-msetdg. Now your SD card should look something like this:
Now Launch RXTools and hold down the R button. Go into Advanced Options and then downgrade your MSET to 6.x. It should successfully install without any problems, hopefully. If no problems occurred, then good. Now turn off your 3DS and restart. Now while in a clean boot of your 3DS, go to the following site:
http://dukesrg.github.io/?code.bin
This will load the code.bin that you had put from the beta 8 of RXTools. It should then crash your browser in a minute or so. If it doesn't crash, then press the Home button. After it crashes, you should be able to do the MSET exploit for the DS profile. Go to System Settings → Other Settings → Profile → Nintendo DS Profile
If it launches RXTools then you are set. If it doesn't, then you will have to install one of the CIAs depending on your location:
Code:
MSET-USA-6.0 0004001000021000
MSET-EUR-6.0 0004001000022000
MSET-JPN-6.0 0004001000020000
You will need to use FBI to install the CIAs. So you will have to boot up RXTools in Sysnand, launching FBI, and installing the CIAs in NAND. (The destination must be read as "NAND")
(Reference)